Two objects are thrown from the top of a tall building and experience no appreciable air resistance. one is thrown up and the other is thrown down, both with the same initial speed. what are their speeds when they hit the street?

What is the maximum acceleration of the wing tips, in units of g?

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?